Online PHP editor | output for P4RVZ

<?php /** * Normalise a flat dot notation array. * * @param array $rows The flat array * @param string $dot The character that separates the layers. * * @return array */ function unflatten(array $rows, string $dot = "."): array { # The last row's main table columns $last_main_table = []; # A collection of all the joined tables belonging to a given row of the main table $joined_tables = []; # For each row in the result set foreach($rows as $id => $row){ # Contains this row's main table columns $main_table = []; # Contains this row's joined table columns $joined_table = []; # Foreach column and value foreach($row as $col => $val){ /** * Whether a column name contains a period or not * is the determining factor of whether the column * belongs to the main table (no period) or a joined * table (periods). */ if(!strpos($col, $dot)){ //if the column belongs to the main table $main_table[$col] = $val; } else { //If the column belongs to a joined table # Break open the column name $col = explode($dot,$col); # Extract out the joined table, and the column names (that may include joined children) $joined_table[array_shift($col)][$id][implode($dot,$col)] = $val; } } # If this is the first row, or if this row's main columns are the same as the last row if(!$last_main_table || ($main_table == $last_main_table)){ # Update the last main table variable $last_main_table = $main_table; # merge all rows of columns belonging to joined tables $joined_tables = array_merge_recursive($joined_tables ?:[], $joined_table ?:[]); # Go to the next row continue; } # At this point, the main columns are different from the previous row's main columns # Add the last row's main columns, merged with all of it's joined table rows to the normalised array $normalised[] = array_merge($last_main_table, $joined_tables); # Update the last main table variable $last_main_table = $main_table; # Reset the joined tables $joined_tables = []; # Add this row's joined table columns $joined_tables = array_merge_recursive($joined_tables ?:[], $joined_table ?:[]); } # Capture the last row $normalised[] = array_merge($last_main_table, $joined_tables); # Go deeper foreach($normalised as $id => $row){ //For each row that is now normalised foreach($row as $key => $val){ //For each column value if(is_array($val)){ //if any of the values are arrays, make sure that array is also normalised $normalised[$id][$key] = unflatten($val, $dot); } } } return $normalised; } $results[] = [ 'id' => 'A1', 'address.id' => '11f456A1', 'address.coordinates.lat' => '12.345', 'address.coordinates.lng' => '67.89', 'address.coordinates.geo.accurate' => true, ]; $results[] = [ 'id' => 'A1', 'address.id' => '22f456A1', 'address.coordinates.lat' => '12.345', 'address.coordinates.lng' => '67.89', 'address.coordinates.geo.accurate' => true, ]; $results[] = [ 'id' => 'A2', 'address.id' => '44f456A2', 'address.coordinates.lat' => '11.345', 'address.coordinates.lng' => '67.89', 'address.coordinates.geo.accurate' => true, ]; $results[] = [ 'id' => 'A2', 'address.id' => '44f456A2', 'address.coordinates.lat' => '22.345', 'address.coordinates.lng' => '67.89', 'address.coordinates.geo.accurate' => true, ]; $normalised = unflatten($results); var_export($normalised);